EP1115524A4 - Foret pour trous de faible profondeur - Google Patents

Foret pour trous de faible profondeur

Info

Publication number
EP1115524A4
EP1115524A4 EP99937540A EP99937540A EP1115524A4 EP 1115524 A4 EP1115524 A4 EP 1115524A4 EP 99937540 A EP99937540 A EP 99937540A EP 99937540 A EP99937540 A EP 99937540A EP 1115524 A4 EP1115524 A4 EP 1115524A4
Authority
EP
European Patent Office
Prior art keywords
short
drill bit
hole drill
hole
support pad
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP99937540A
Other languages
German (de)
English (en)
Other versions
EP1115524B1 (fr
EP1115524A2 (fr
Inventor
Fred R Larson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Diesel Technology Co
Original Assignee
Diesel Technology Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Diesel Technology Co filed Critical Diesel Technology Co
Publication of EP1115524A2 publication Critical patent/EP1115524A2/fr
Publication of EP1115524A4 publication Critical patent/EP1115524A4/fr
Application granted granted Critical
Publication of EP1115524B1 publication Critical patent/EP1115524B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/02—Twist drills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/04—Drills for trepanning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/14—Configuration of the cutting part, i.e. the main cutting edges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/20—Number of cutting edges
    • B23B2251/201—Single cutting edge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/56—Guiding pads
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/03—Processes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/55—Cutting by use of rotating axially moving tool with work-engaging structure other than Tool or tool-support
    • Y10T408/557—Frictionally engaging sides of opening in work
    • Y10T408/558—Opening coaxial with Tool
    • Y10T408/5583—Engaging sides of opening being enlarged by Tool
    • Y10T408/5586—Engaging surface subsequent to tool-action on that surface
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/89—Tool or Tool with support
    • Y10T408/909—Having peripherally spaced cutting edges
    • Y10T408/9095—Having peripherally spaced cutting edges with axially extending relief channel

Definitions

  • the present invention relates to short-hole drill bits including short- hole reamers.
  • a typical drill bit is used to drill a hole having a diameter slightly smaller than the desired diameter of the final hole.
  • a single or multi-point reamer is used to ream the drilled hole, increasing the diameter slightly, and making the final hole the desired size.
  • Deep-hole drilling techniques have addressed similar problems related to centering a deep-hole drill bit .
  • a gun drill has a bit designed to center itself during drilling.
  • deep-hole drilling techniques that prevent the easy adaption of deep-hole drilling techniques to short-hole drilling.
  • a gun drill has a bit connected to a long steel shank that is brazed to the bit. The long steel shank bends very easily.
  • a gun drill may do a good job of drilling a deep hole, a gun drill cannot do a very good job of reaming a deep hole because the long steel shank tends to flex during drilling. If the rough drilled hole that is to be reamed is not straight, the gun drill will simply follow the path of the pre-drilled hole. Thus, the gun drill will not self-center to form a clean bore meeting a strict tolerance.
  • an object of the present invention to provide a short- hole drill bit for forming clean bores when the bore being formed intersects a blind bore.
  • a short-hole drill bit comprises a unitary body having a shank portion and a working portion.
  • the body defines a central axis and has a periphery.
  • a substantially V-shaped flute extends axially along the working portion. The flute defines a cutting edge and a passive edge at the body periphery.
  • the short-hole drill bit further comprises a support pad located along a portion of the body periphery.
  • the support pad is located with respect to the cutting edge based on a normal cutting force and a tangential cutting force at the cutting edge.
  • a resultant cutting force is directed at the support pad to cause the support pad to center the short-hole drill bit during operation.
  • a short-hole drill bit comprises a unitary body having a shank portion and a working portion, a substantially V-shaped flute extending axially along the working portion, and a support pad along the body periphery.
  • the support pad extends through a portion of the body periphery that is substantially opposite the flute such that a resultant cutting force at the cutting edge is directed at the support pad to cause the support pad to center the short-hole drill bit during operation.
  • a method for short-hole drilling workpiece comprises forming a pilot hole in the workpiece, and positioning a short-hole drill bit at the pilot hole.
  • the short-hole drill bit has a unitary body having a shank portion and a working portion, a substantially V-shaped flute, and a support pad located with respect to the cutting edge such that a resultant cutting force is directed at the support pad.
  • the method further comprises forming the short-hole in the workpiece,. with the resultant cutting force directed at the support pad to cause the support pad to center the short-hole drill bit during operation.
  • embodiments of the present invention allow the forming of clean bores, even when the bore to be formed intersects an existing blind bore, with relatively few operations. That is, a short pilot hole, which only need be deep enough to allow initial centering of the short-hole drill bit of the present invention, may be formed. Then, the hole may be accurately drilled in one operation without the need for using a point reamer thereafter.
  • Embodiments of the present invention make it possible to form clean bores with high accuracy, at decreased manufacturing costs.
  • FIG. 1 is a pictorial view of a short-hole drill bit made in accordance with the present invention
  • FIG. 2 is a side view of the short-hole drill bit shown in FIG. 1;
  • FIGS. 3(a) - (c) depict the tip of the short-hole drill bit shown in
  • FIG. 2
  • FIG. 4 is an enlarged view of the tip of the short-hole drill bit of FIG. 2;
  • FIG. 5 is a schematic diagram illustrating cutting forces associated with short-hole drill bits of the present invention.
  • FIG. 6 is a schematic diagram illustrating the operation of a short- hole drill bit of the present invention for drilling a bore intersecting a blind bore;
  • FIG. 7 is a side view of an alternative embodiment for a short-hole drill bit of the present invention.
  • FIGS. 8 (a) - (c) illustrate the tip of the short-hole drill bit shown in FIG. 7;
  • FIG. 9 is a enlarged view of the tip of the short-hole drill bit shown in FIG. 7.
  • FIG. 10 is a block diagram illustrating a method of the present invention for drilling a short-hole.
  • Drill bit 10 has a unitary body 12 with a shank portion 14, a working portion 16, and a central axis 18. Unitary shank and working portions 14 and 16, respectively, are advantageous in that a rigid hard drill bit is formed that does not have the bending problems associated with the long steel shanks of gun drills.
  • Drill bit body 12 has a periphery 20.
  • a substantially V-shaped flute 22 extends axially along working portion 16.
  • flute 22 defines a cutting edge 24 and a passive non-cutting edge 26 at body periphery 20.
  • a support pad 30 is located along a portion of body periphery 20. Support pad 30 is located with respect to cutting edge 24 based on a resultant cutting force at cutting edge 24 during operation. Support pad 30 is located such that the resultant cutting force is directed at support pad 30 to cause support pad 30 to center drill bit 10 during operation.
  • flute 22 is a straight flute; however, alternatively a twisted flute may be used. Accordingly, if a twisted flute is used, a twisted support pad is used as well such that cross sections of the drill bit are substantially identical in that the pad is always located to receive the resultant cutting force throughout the length of the cutting edge.
  • unitary body 12 is preferably formed of carbide, more particularly, a carbide with about 10% cobalt. Of course, other materials may be suitable for forming a sufficiently rigid drill bit.
  • body 12 has an abrasive resistant coating. Titanium Carbon Nitride (TiCN) is one example of a suitable abrasive resistant coating, and is preferred.
  • a short pad As best shown in FIG. 4, in a preferred embodiment, a short pad
  • Short pad 34 is located along a portion of body periphery 20 at cutting edge 24. Short pad 34 extends less than about 10 degrees in a circumferential direction about body periphery 20. Further, it is preferred that support pad 30 extends more than about 90 degrees in a circumferential direction about body periphery 20.
  • the materials and dimensions mentioned above are examples of suitable materials and dimensions and that short-hole drill bits may be formed in accordance with the present invention having different materials and/or dimensions than those stated above.
  • Body working portion 16 defines a tip, generally indicated at 40, with a first surface 42 and a second surface 44.
  • First surface 42 is located adjacent to cutting edge 24.
  • Second surface 44 is located between passive edge 26 and first surface 42.
  • first surface 42 is substantially perpendicular to body central axis 18, and that second surface 44 is chamfered with respect to first surface 42. As depicted, first surface 42 and second surface 44 share a common edge 46.
  • first surface 42 and second surface 44 oriented as described immediately above are a preferred feature at tip 40.
  • the periphery of tip 40 is preferably chamfered along an outer edge 48 of first surface 42 and along an outer edge 50 of second surface 44.
  • tip 40 is preferably chamfered at an edge 52 of second surface 44 that is adjacent to passive edge 26.
  • drill bit 10 and support pad 30 are shown with the cutting forces.
  • a normal cutting force at cutting edge 24 when drill bit 10 is in operation is indicated at 60.
  • a tangential cutting force at cutting edge 24 during operation of drill bit 10 is indicated at 62. The resultant of normal cutting force
  • Resultant force 64 is directed at support pad 30 in accordance with the present invention.
  • a drill bit 66 of the present invention is shown in operation.
  • the cutting edge is indicated in solid line at 70
  • the support pad is indicated in solid line at 72.
  • the cutting edge is indicated in long dashed line at 74
  • the support pad is indicated in long dashed line at 76.
  • the cutting edge is indicated in short dashed line at 78, while the support pad is indicated in short dashed line at 80.
  • Drill bit 90 has a unitary body 92 with a shank portion 94 and a working portion 96. Drill bit 90 is similar to drill bit 10 (FIGS. 1 - 4); however, drill bit 90 is shown having a twisted flute
  • drill bit 90 is shown having a passage 100 extending axially through body 92 for routing coolant during operation.
  • the support pad extends through a portion of the drill bit body periphery that is substantially opposite the flute such that a resultant cutting force at the cutting edge is directed at the support pad.
  • the positioning of the support pad, and the circumferential distance that the support pad extends may vary based on expected normal and tangential cutting forces for a given application for the drill bit.
  • a block diagram depicts a method for short-hole drilling a workpiece in accordance with the present invention, and is generally indicated at 110.
  • a pilot hole is formed in the workpiece.
  • a short-hole drill bit is positioned at the pilot hole.
  • the short-hole drill bit has a unitary body with a shank portion and a working portion, and has a support pad arranged such that a resultant cutting force is directed to the support pad to center the short-hole drill bit during operation.
  • the support pad engages the pilot hole interior walls and a short-hole is then drilled. The support pad centers the short- hole drill bit during drilling (or reaming).
  • pilot hole may simply be a shallow starter hole such that the short-hole drill bit removes a large amount of material to form the desired hole. It is to be further appreciated that the pilot hole may be a traditional full depth pilot hole such that the short-hole drill bit functions as a reamer.
  • short-hole drill bit and “clean bore reamer” are used interchangeably to describe embodiments of the present invention, and that either of those terms or other similar terms are meant to encompass short-hole drill bits that are used for drilling and short-hole drill bits that are used for reaming.
  • a suitable length to diameter ratio for a short-hole drill bit of the present invention is at most about 6 to 1.
  • length to diameter ratios of 6 to 1 or below are most suited for applications requiring short-hole drill bits of the present invention, length to diameter ratios greater than about 6 to 1 are possible.
  • the suitable length to diameter ratios for short-hole drill bits of the present invention are far different than suitable length to diameter ratios for gun drills.
  • the length to diameter ratio may approach as much as 50 to 1.
  • gun drills are far different than short-hole drill bits, and are used for different applications which typically include drilling but do not include reaming.
  • embodiments of the present invention produced excellent results when employed in reaming applications. It is believed that embodiments of the present invention are capable of reaming a hole such that roundness, straightness, and taper are all within 2 microns. Further, embodiments of the present invention have been found to be capable of reaming bores with such precision that size will repeat within about 2 microns. From tool to tool, size will repeat within about 5 microns. Of course, it is to be appreciated that a precision spindle and tool holder should be used when an application has strict tolerances. Of course, it is to be further appreciated that the capabilities of embodiments of the present invention described in this paragraph are exemplary, and have been found by testing. Short-hole drill bits of the present invention may be configured to perform to stricter specifications or looser specifications than those described immediately above, as required for a particular application, and as would be readily understood by one of ordinary skill in the tool designing arts.
  • a flat bottom can be produced without a center relief, and without compromise to hole geometry. That is, in a preferred construction of a short-hole drill bit of the present invention, the cutting edge extends all the way to the tool tip to produce the flat bottom when cutting.
  • embodiments of the present invention allowed the inventor to go from leaving 150 microns of stock to hone, to leaving only about 75 microns of stock to hone after reaming.
  • the finish honing process became easier and less expensive to perform.
  • the inventor was able to eliminate a costly honing operation because the short-hole drill bit of the present invention was able to meet tolerances for the part.
  • the two application described in this paragraph are exemplary only, and the performance of a short- hole drill bit may vary based on a variety of factors that would be apparent to one of ordinary skill in the tool designing arts.

Abstract

La présente invention concerne un foret pour trous de faible profondeur et son mode d'utilisation. Ce foret comporte un corps unitaire, une goujure en forme de V et une zone d'appui. Le corps unitaire comporte une partie tige et une partie travail. La goujure, qui se développe axialement le long de la partie de travail, définit un bord de coupe et un bord passif à la périphérie du corps de foret. La zone d'appui est disposée le long d'une partie périphérique du corps du foret. Son emplacement est déterminé en fonction d'une force de coupe normale et d'une force de coupe tangentielle au niveau du bord de coupe. La force de coupe résultante est dirigée vers la zone d'appui, ce qui fait que cette zone assure le centrage du foret pendant le perçage.
EP99937540A 1998-07-29 1999-07-27 Foret pour trous de faible profondeur Expired - Lifetime EP1115524B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US124482 1998-07-29
US09/124,482 US5967707A (en) 1998-07-29 1998-07-29 Short-hole drill bit
PCT/US1999/017006 WO2000006329A2 (fr) 1998-07-29 1999-07-27 Foret pour trous de faible profondeur

Publications (3)

Publication Number Publication Date
EP1115524A2 EP1115524A2 (fr) 2001-07-18
EP1115524A4 true EP1115524A4 (fr) 2004-05-06
EP1115524B1 EP1115524B1 (fr) 2007-05-30

Family

ID=22415150

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99937540A Expired - Lifetime EP1115524B1 (fr) 1998-07-29 1999-07-27 Foret pour trous de faible profondeur

Country Status (6)

Country Link
US (1) US5967707A (fr)
EP (1) EP1115524B1 (fr)
JP (1) JP2002521223A (fr)
CA (1) CA2338810A1 (fr)
DE (1) DE69936218T2 (fr)
WO (1) WO2000006329A2 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3847016B2 (ja) * 1998-12-09 2006-11-15 富士精工株式会社 円形穴の仕上加工方法および一枚刃リーマ
WO2001015844A1 (fr) * 1999-08-31 2001-03-08 Bitmoore, An Oregon General Partnership Dispositif de determination de centre dans un trepan sans extremite pointue
EP1728575B1 (fr) * 2004-03-26 2017-04-19 Makino Milling Machine Co. Ltd. Méthode de coupe et dispositif d'outil de coupe
JP4955261B2 (ja) * 2005-12-02 2012-06-20 ユニタック株式会社 ガンドリル
JP4984277B2 (ja) * 2009-05-29 2012-07-25 株式会社タンガロイ リーマ
DE102010050351A1 (de) 2010-11-05 2012-05-10 Botek Präzisionsbohrtechnik Gmbh Einlippenbohrer
US20230182215A1 (en) * 2021-12-13 2023-06-15 Iscar, Ltd. Cutting tool part having an additively manufactured cutting portion with integrally formed guide pads and method of manufacturing same
JP2023165067A (ja) * 2022-05-02 2023-11-15 株式会社タンガロイ ガンドリル用のボディ

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FR507822A (fr) * 1919-03-12 1920-09-24 Hippolyte Caillon Foret à arete coupant jusqu'au centre du trou
FR1363457A (fr) * 1962-05-10 1964-06-12 Stora Kopparbergs Bergslags Ab Foret pour perçage profond
US4642003A (en) * 1983-08-24 1987-02-10 Mitsubishi Kinzoku Kabushiki Kaisha Rotary cutting tool of cemented carbide
EP0380096A1 (fr) * 1989-01-26 1990-08-01 Sumitomo Electric Industries, Ltd. Foret en métal dur

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US26452A (en) * 1859-12-13 underbill
US1323278A (en) * 1919-12-02 Barrel-reamer
US499098A (en) * 1893-06-06 Pipe-burr-removing implement
US1454851A (en) * 1919-07-16 1923-05-15 Gerdil Henri Prosper Drill
US2188928A (en) * 1936-06-20 1940-02-06 Charles W Stevens Drill for drilling holes in wood
US2276532A (en) * 1940-05-29 1942-03-17 Bethlehem Steel Corp Drill
US2289065A (en) * 1941-01-02 1942-07-07 Edd C Oliver Drill for rifle barrels
US2325535A (en) * 1941-10-28 1943-07-27 Albert J Nordberg Drill
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JPS5943245B2 (ja) * 1978-10-11 1984-10-20 三菱マテリアル株式会社 １枚刃穴明け工具
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JPS629811A (ja) * 1985-07-08 1987-01-17 Mitsubishi Metal Corp ガンドリル
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JPS6451216A (en) * 1987-08-18 1989-02-27 Mitsubishi Metal Corp Gun drill
JP2555676B2 (ja) * 1988-03-22 1996-11-20 三菱マテリアル株式会社 表面被覆炭化タングステン基超硬合金製エンドミルおよびドリル
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JP3515158B2 (ja) * 1994-02-25 2004-04-05 三菱マテリアル株式会社 ガンドリル

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR507822A (fr) * 1919-03-12 1920-09-24 Hippolyte Caillon Foret à arete coupant jusqu'au centre du trou
FR1363457A (fr) * 1962-05-10 1964-06-12 Stora Kopparbergs Bergslags Ab Foret pour perçage profond
US4642003A (en) * 1983-08-24 1987-02-10 Mitsubishi Kinzoku Kabushiki Kaisha Rotary cutting tool of cemented carbide
EP0380096A1 (fr) * 1989-01-26 1990-08-01 Sumitomo Electric Industries, Ltd. Foret en métal dur

Also Published As

Publication number Publication date
WO2000006329A3 (fr) 2000-05-04
JP2002521223A (ja) 2002-07-16
EP1115524B1 (fr) 2007-05-30
DE69936218T2 (de) 2008-02-28
EP1115524A2 (fr) 2001-07-18
DE69936218D1 (de) 2007-07-12
US5967707A (en) 1999-10-19
WO2000006329A2 (fr) 2000-02-10
CA2338810A1 (fr) 2000-02-10

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